Down here we got a lot of Warm Weather my 3 Boys were on the Boat as soon as Momma was able to also. The oldest around 3 years could run the Boat fairly well (with Dads close Supervision) when we were away from any boat traffic.
Problem is the little Ones like Speed and are totally fearless! They make a whole Lot of really nice Life Jackets or Ski Jackets for the little Guys. Which I tested with them in the Pool!